Apparatus for cooling electric motors and generators.



No. 839,096. PATENTED DEC. 25, 1906,

A B. BIDWELL. 4 APPARATUS FOR COOLING ELECTRIC MOTORS AND GENERATCRS.

APPLICATION FILED MAY 28. 1906.

NITED l STATES PATENT OFFICE.

' BENSON BIDWELL, OF CHICAGO, iLLiNOIS. APPARATUS FOR COOLING ELECTRICMOTORS AND GENERATORS.

Speccaton of Letters Patent.

Patented Dec. 25, 190e.

y Application filed May 28, 1906- Serial No. 319,083.

.To all whom it may concern.-

Be it known that I, BENSON BIDWELL, a citizen of the United States,residing at Chicago, Cook county, Illinois, havemvented certain new anduseful Improvements in Apparatus for Coolin Electric Motors andGenerators, of which t e following, taken in connection with the dra gs,is a description.

My invention has for'its object the production of apparatus for keepingelectric motors and generators cool while in opration, and therebyprevent a large percentage of the loss causedby said motors heating andoften burning out. Heretofore various means have been employed to attainthis result, some of which have been more or less successful, but notsuificiently so to produce a practical operative improvement over oldmethods, largely for the reason that the cooling agent employed was notcontinuously condensed or reinforced after its e ansion or refrigerationand vcontinuously introduced within and throughout the machine in a waythat would produce the result desired.

By my present invention I have provided a combination of mechanismswhich entirely overcome the above-named objection and, as will behereinafter explained, can be regulated to a nicety as to the closeconnections applied to return the cooling gas or freezing su stance intothe compressor or pump an recompress or 'reinforce it las fast as it eX-pands and refrigerates, thus enabling me to continuously run a motor orgenerator entirely cold for any length of time desired without stopping,thus enhancing-the ractical use, value, and life of those mac es manytimes. keeping generator cold the speed of the armature can be doubled,and thereby increase the capacity of the machine by a hundred per cent.

By my improved method of using the combination of a compressor, acondenser, or a pum and a motor I can either increase the spee of thearmature or can build the motors and generators at about one-half of thecost and size of those now in use and get the same capacity now obtainedfrom ordinary motors and generators.

I have illustrated one form of device embodying the principle of myinvention, al-

It is a well-known fact that byform of construction, and which casing ispreferably air-tight.

Bv is a com ressor which may be of any form in genera use and which isoperated by any suitable source of power transmittedthereto through thebelt and pulley B', or it may have a direct connection.

C is a tank which is preferably kept filled with cold water through pipec, and inside of -said tank are the condensing-coils C.

I wish to be understood as contemplating the use of any cooling agentsuitable'for the purpose, but preferably gas, which is replenished inthe compressor throu h pipe D,

which pipe may be connected wit any suitable su plyofrefrigeratinsubstance. When the valira e is opened, t e gas enters the motor-cas" Athrough ipe E and there expands alii refrigerates t e interior of themotor. The cooling gas or refrigerating substance returns to thecompressor through pipe F and is again compressed in compressor B andpasses into the condenser-coils C', being used over and overcontinuously. Cooling-coils may or may not be provided inside of thecasing A inclosing the motor.

The advantages of my invention will be apparent to those skilled in theart.

hanges in the details of construction may be made without departing fromthe spirit of my invention, which consists, essentially, in providingmeans for continuously supplying a constant refrigeration to the motor,preventing it from heating, and returning the expanded gas or othersubstance back to the compressor or pump to be used over again.

I claim- In an apparatus of the character described, the combinationwith a dynamo-electric machine and an air-tight casing inc losing thesame and forming an expansion-chamber for a cooling agent, of acondenser and a com- IOO pressor located exteriorly of said eesin andpipes connecting seid compressor en condenser With the interior of seidcasing Whereby the cooling agent is conveyed from the condenser to seidcasino and after it has expanded is carried to t'ie compressor to beused over again,

i smoes In. testimoiiy whereof I have signed this specification 1n thepresence of two subscribY F. H. Kme, D. C. Palese

